Joss Stone shocked drinkers at a bar near her home in the English countryside by exercising her famous vocals during a karaoke event.The soul star headed to a pub in Torquay, England with a group of female pals to celebrate a friend's recent engagement. And she was more than happy to give stunned revellers a free mini-gig by grabbing a microphone and singing along to a backing track. Brett Morton, the owner of the Offshore Bar, tells the U.K.'s Daily Star newspaper, "Joss was with a large engagement party. She danced like a nutter and was only too happy to sing."